Power-hammer.



Patented Ian. 30, I900.

E. H. BLOSSOM.

POWER HAMMER.

(Application filed Feb. 26, 1898.;

(No Hodei.)

W/TNESSES lA/VENTOR 'Uriirno STATES PATENT Canine.

EDWARD II. BLOSSOM, OF ST. JOHNSBURY, VERMONT, ASSIGNOR TO THE DUPONTMANUFACTURING COMPANY, OF SAME PLACE.

POWER-HAMMER.

SPECIFICATION forming part of Letters Patent No. 642. 7 dated January 0-Application filed February 26, 1898. Serial No. 671,871. (No model.)

'0 (477/ whom it may concern:

Be it known that I, EDWARD H. BLOSSOM, a citizen of the United States,residing at St. Johnsbury, in the county of Caledonia and State ofVermont, have invented certain new and useful Improvements inPower-Hammers, of which the following is a specification.

My invention relates to improvements in power-hammers in which avertically-reci pro- [0 eating head operates in conjunction with a fixedanvil; and the objects of my improvement are, first, to provide springsor cushions by means of which the rigid parts of the frame are relievedof the shock or jar communicated thereto by the reciprocating head, and,second, to provide means forbringing the reciprocating parts to acondition of rest immediately after the work is done. I attain theseobjects by the mechanism illustrated in the accompanying drawings, inwhich Figure 1 is a perspective of the complete machine. Fig. 2 is adetail of spring-cushioned bolts holding front guide-plate. Fig. 3 is avertical section showing brake applied. Fig. 4 is a vertical side viewof same, and Fig. 5 is a vertical section showing brake not in use.

Similar letters refer to similar parts throughout the several views.

to is the frame of the machine, the lower part of which is designated byu in showing the anvil part of the machine.

tis the hammer-head or ram, held in suspension or operated by thespring-actuated mechanism (shown at a) and the crank wheel (1) 1 disk(Z, revolubly supported on frame w,

In Figs. 1 and 2, r is the front plate of guidebox q, in which thehammer runs. The front plate 7 is held in place on guide-box g by meansof bolts e passing through ribs on guide-box q and the ribs 5 on frameto. Bolts 6 are provided with springs, as shown atf, Fig. 2. I makethese springs of any spring material suitable for use in this class ofmachinery, but prefer flat steel springs or heavy coiled wire, theobject of the spring being to provide an elastic cushion for theretaining-bolts of guide-plate 7', whereby any abnormal jar or shock isabsorbed without injury to the working parts of the machine.

It can readily be seen that the particular form of spring is immaterial,and the spring is required to work buta very short distance, and whileallowing the front guide-plate considerable flexibility has sufficientcontrol of said guide-plate to prevent it from getting out of alinement.

In Fig. 4,11 is a tightening-pulleyrunning onbeltjj and is revolublysupported on a bellcrank lever b, pivoted at or near its middle sectionon pin 1), which is supported by a lug cast on frame to of the machine.Pin 1) projects through bell-crank lever l) and in to a recess in pulleyu. p is flattened at its inner end, as shown at t, Figs. 3, 4, and 5.

Z) is a metal ring of a size a trifle smaller than the recess in pulleyn, in which it is placed. This metal ring or brake is cut through at m,midway between the adjustable lugs h. The brake-ring has a boss at itslower internal side, into which a pin from w is inserted that preventsthe brake-ring from being turned with the pulley.

The end 7: of bell-crank lever 12 is connected to foot-treadle 'v by arod. Depressing the treadle o draws down the end 75 of bell-crank lever19 and correspondingly swings the other end, on which is supportedpulley a, through an arc of a circle, forcing pulley a against beltj,tightening it sufficiently to cause pulley it to revolve, carrying withit the shaft 0, on which is keyed crank wheel or disk (I, which operatesthe reciprocating parts of the machine.

Fig. 5 shows the parts in position with the machine at work, in which itwill be seen the flattened end 2' of pin 1) stands in a verticalposition, allowing the brake-ring to spring together and not touchpulley it. The pin 19 has a weighted lever keyed on its outer end, onwhich is an adjustable weight 0, Fig. 1. The function of this weight isto raise the end of bell-crank lever 19 when the pressure on treadle vis removed, carrying tightener 0; back through an arc of a circle,releasing the belt. At the same time it turns pin 1) until its largerdiameter infringes on adjustable lugs h, forcing them apart and by themforcing the brake-ring b open at m, causing it to bear forcibly allaround the inner surface of pulley n. It will be seen that by means ofthe adjustable lugs h the brake can be so ad- -belt and driving-pulley adivided spring brake-band, provided with internal lugs near its point ofdivision, and arranged to bear against the said pulley when these lugsare forced apart, a bell-crank lever having its horizontal stem extendedat one end, flattened and arranged between the said lugs to act thereonwhen partly turned, a tighteningpulley carried by the said bell-cranklever and arranged to bear against the said driving-belt, acounterbalance-weight attached to an arm of the said lever and operatingto force the said pulley against the said belt and to turn the said stemso as to allow the contraction of the said brake-band and the freerotation of the said driving-pulley substantially as set forth.

E. H. BLOSSOM.

WVitnesses:

GEO. W. CREE, ANNA NAsH.

